单项选择题

You'd better ______ the water until it has been boiled.

A．not drunk
B．not drinking
C．not to drink
D．not drink
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单项选择题
The number of tigers in this area ______ said to be______.
A．is; rising
B．are; rising
C．is; raised
D．are; raised
单项选择题
He ______ people with less knowledge than he has.
A．looks up
B．looks down upon
C．looks at
D．look after
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